220 laser ecu on a 2.5

**stan merck** · 12-05-2004, 05:49 PM

I have seen on here where some people have ran a 220 ecu on a 200 2.5. Will that ecu be rich enough for a very mild 2.5. Will the map sensor compensate enough. It does when people bolt the Brucatto intakes on so it seems like it could handle a 2.5's needs. Or would it be just too lean?

**steve** · 12-05-2004, 10:28 PM

The 220 never really made much more then a good 200 from what we have seen. But 200hp worth of fuel is 200hp worth of fuel at the top. On the bottom it may run a bit leaner on the 2.5 but not that much. That should be a good combo. The TPI only works up til 3000 rpm or so and that may need a bit of adjusting for the 2.5 bottom end. The MAP tells the ECU the engine load and should be roughly the same between the 2 motors. You can compensate the vacuum a bit by moving around your timing. You probably have a soft limiter on that box too so it should rev up nice.

**KIRCHNER** · 08-17-2019, 03:47 PM

how are these old posts coming up on top?????

**Merc 2.5** · 08-17-2019, 04:02 PM

Well I do believe the 2.4 200 had much more demand for fuel ,being piston ported compared to 2.5 behind liner porting , I think it would be rich enough to give it a shot, just install a gud reading plug